B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/680
B29C 45/82 (2006.01) B29C 45/50 (2006.01)
Patent
CA 1150460
A B S T R A C T Hydraulic controls for the injection unit of an in- jection molding machine of the type which has tandem support- ing bridges rining on two guide rods and hydraulic cylinder assemblies surrounding the rods the cylinder assemblies in the rear supporting bridge which control the movements of the plastification screw being convertible from single-acting cylinders to double-acting cylinders with a differential pis- ton, for the selective connection to a first hydraulic con- trol system which has presettable proportional-response con- trol valves for the adjustment of the pressure and flow rate of the hydraulic fluid, or to a second hydraulic control sys- tem which provides a continuous electronic control input to a servo-valve, adjusted by an electronic feedback loop with pressure transducers. The conversion involves the exchange of a piston and a cylinder cover in the two cylinder assem- blies of the rear supporting bridge.
349428
Hehl Karl
Macrae & Co.
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